Lining composition and container wall lined therewith



Patented Oct. 12, 1948 LINING COMPOSITION AND CONTAINER WALL LINEDTHEREWITH Rudolph M. Snyder, Kansas City, Mo., assignor to Henry A.Johnson, Kansas City, Mo.

No Drawing. Application March 28, 1945,

Serial No. 585,391

8 Claims. 1

This invention relates to a novel barrier lining or coating compositionfor cartons, barrels and other containers that are used for storing andshipping solid or semi-solid substances such as asphalt, bitumens,resins, tars and the like which have a tendency to adhere to the wallsof the container, and to the method of making it. It also relates tocontainers lined with the coating of my invention to prevent the solidcontents of the container from adhering to the walls thereof.

The containers to which the coating or lining composition of myinvention is applied may be of a permanent character such aswood, metal,etc., and they may also be of the so-called throwaway carton or drumtype which are used but once, such as containers made from paper board,

box board, wood pulp and like fibrous materials. The fibrous cartons anddrums are now more generally used to store and ship such products assolidified asphalt, for example, since these filled containers are morereadily transported and are less costly. My invention will beparticularly described in connection with such containers, but it is tobe understood, however, that it is not to be construed as limitedthereto since the lining or coating composition of my invention is alsoa very eifective barrier lining or coating which prevents thesolidcontents from adhering to the walls of the more permanent, type ofcontainers such as wood barrels and metal drums.

Materialswhich are liquid when hot and solids when cooled such asasphalt, for example, when prepared for storage or shipping, are usuallypiped or poured hot into fibrous cartons or drums and permitted to cooland solidify. On cooling, the asphalt tenaciously adheres to the wallsof the container making it exceedingly difficult, if not impossible, tostrip the container from the asphalt without leaving adherent pieces ofthe container on the asphalt. The prior art carton or drum coatings orlinings which have been used heretofore to prevent adherence ofsolidified asphalt to the container walls and permit the ready strippingof the. container from the asphalt have not been entirely satisfactoryand/or have been so costly as to make their use prohibitive.

In accordance with the present invention I have provided a novelcomposition which is unusually effective as a barrier coating or liningfor containers adapted to receive hot liquefied products such asasphalt, bitumens, resins, etc., to prevent the adherence of thesolidified contents to the container walls and permit the latter to bestripped readily and cleanly from the solidified contents, and which issimple to make and is relatively inexpensive. My composition has otheradvantages which will be made apparent from the following description ofmy invention. In this description reference will be made only to the useof the invention as a barrier lining for cartons or drums for storing orshipping asphalt, but it is to be understood that containers lined withthe barrier coating of my invention may be used for storing or shippingmaterials such as bitumens, resins, Waxes and like materials which areliquid when hot and solid when cooled.

The barrier lining or coating composition of my invention comprises anaqueous wax emulsion containing a thickener which also functions as anadditional emulsifying agent for the composition, a, material whichmakes the coating slick and smooth and reduces the penetration of thecomposition into the fibrous walls of the container when the hot asphaltis poured into it, and a plasticizer which functions to prevent crackingof the coating during drying or bending of the container or of thecoated sheets which are to be formed into the container. A preferredcomposition in accordance with my invention comprises an aqueous waxemulsion in homogeneous admixture with bentonite, graphite and aplasticizer, The preferred plasticizer is a non-crystallizing commercialsolution (syrup) of sorbitol sold by Atlas Powder Company under the nameArlex. This composition when made up in accordance with my invention is,preferably, in pasty form and may be spread with a roll or doctor bladeupon a sheet of fibrous material which is to be formed into the cartonor drum, although it may 5 be applied by a spraying operation. In thelatter case, thinning of the composition with water, for example, may benecessary. Regardless of the manner of applying the composition to thefibrous sheet, it adheres to the sheet and the coating is slick andsmooth and free from holes or other breaks which would permit thehotasphalt to contact the walls of the container and adhere thereto.

The following is an example of the preferred composition in accordancewith my invention and of the method of making it. It being understoodthat the proportions of the ingredients as well as other details may bevaried without departing from the invention claimed in the appendedclaims.

15 lbs. of bentonite are mixed with 12 gals. of water in a suitablecontainer and allowed to stand for about 12 to 24 hours to permit themixture to become homogeneous and. smooth. In general,

the longer this mixture stands the more homogeneous and smooth itbecomes.

lbs. of parafiin wax and 2 lbs. of oleic acid are heated to about 160 F.to form a homogeneous mixture and lbs. of water and 1 lb. oftriethanolamine are mixed and heated to about 160 F. The two mixturesare mixed hot, thereby effecting a reaction between the oleic acidandthetriethanolamine to form an emulsifying agent which serves to maintainthe dispersed particles of wax in stable emulsion form throughout theresulting emulsion.

To form the barrier lining or coating composi-v tion of my invention,the wax emulsion is permitted to cool to about 80 to 90 F. and lbs.thereof are then thoroughly mixed with 55 lbs. of the bentonite-Watermixture. The mixing may be effected in any suitable container,preferably one provided with mechanical agitating devices. After the waxemulsion and the bentonitewater mixture have been mixed, 7 /2, lbs. ofwater, 2 1bs.,of graphite and 3% lbs. of Arlex are added and theingredients are thoroughly mixed. The resulting mixture is ahomogeneous, pasty mass which remains stable for reasonably long periodsof time. It may *be applied readily to the fiber sheet to be formed intothe drum or directly to the walls of a drum by spreading with a doctorblade or other device in accordance with conventional procedures. Thecoating is slick and smooth and adheres to the fibrous material, andthere is very little penetration of the coating into the fibers.

When hot asphalt is poured into a container lined with the compositionof my invention and strikes the coating it causes all or most of the Waxconstituent thereof to be driven therefrom into the fibrous wall,leaving the other solids at the surface to act as a barrier between the.as-- phalt and the container wall, thereby preventing adherence of theasphalt to the container wall.

Since the original adhering constituent of the composition of myinvention. is driven. from the composition into the wall of thecontainer, the

residual coating is essentially of a non-adherent character and permitsthe ready removal, as by stripping, of the container from the solidifiedasphalt. The stripping of the container is clean because the coatingeffectively prevents direct contact of the asphalt with the walls of thecontainer at all times. 1

While Arlex is the preferred plasticizeror flexibilizer in accordancewith my invention, other conventional aqueous-soluble or aqueousmiscibleplasticizers of the hygroscopic type such as glycerine and the like maybe used. The bentonite is preferred because it serves not only tothicken the composition but to assist in maintaining it in homogeneousform. Kaolin may be 'used in lieu of the bentonite, but it. is not aseffective and requires considerably larger proportions' of this materialthan of the bentonite. Talc, soapstone or other similar materials may beused in lieu of the graphite. As for the wax emulsion, other waxes suchas beeswax and other conventional emulsifying agents may be used. Also,if desired, any wax emulsion, regardless of the manner of making it, maybe used in lieu of the wax emulsion of my preferred example, the onlylimitation upon such emulsion being that the wax constituent be capableof functioning in the same manner as the paraflln wax of the preferredexample.

The proportions of the ingredients of the coating. composition of myinvention may be varied rather widely as will be readily' apparent to askilled worker in the art; however, the best re;- sults are secured withthe ingredients of the pre ferred example in the proportions there setforthl.

I claim:

1. A. coating composition adapted particularly for lining fibercontainers to prevent the sticking thereto of asphaltand the like whenthe same is poured hot into the container and permitted to cool, saidcomposition consisting essentially of water, dispersed particles of wax,bentonite and graphite, and a plasticizer of the hygroscopic type,.saidzconstituents. being in. homogeneous; admixture and being presentin proportions-to provide a pasty, spreadable mass, with the bentomte.present therein in. substantially greater proportime than the graphiteand: thewaxin suhstane tially the same proportions; as the bentonite,the said bentonite and graphite serving. as; the har ri-er constituents.y

2-. The coating; compositionset ffii'thlin claim 1 wherein the: waxparamn wax- 3. The. coating composition. set. forthinclai m 1 whereinthe plasticizer is :sorbitol.

4. The. coating composition set forth in, claim 1. wherein theplasticizer is glycerine.

51 A fibrous container wall lined with .anade herent, pasw coatingvconsisting essentially of a homogeneous. mixture of bentonite, wax,graphite, water and a plasticizerof. the hygroscopic type, the said,constituents being present in proportions to provide the; aforesaid.mating; with the.

bentonite present therein. substantially greaterproportions. than thegraphite and the. waxin. substantially the some proportions asthebentonite.

e. The fibrous container wall at claim a wherein the wax in the coatingparaflin: Wall.

7. The fibrous container wall of 52 wherein the plasticizer in thecoating is sorbitnL '8. The fibrous. container wall of 5 wherein theplasticizer in the coating is gl'yoerine.

RUDOLPH M.

REFERENCES CITED The following references are of record in the file ofthis patent:

Q STATES PATENTS

